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在SDK的openwrt里面，搜索fstab文件，把里面/overlay挂载点选UDISK分区就行
视频是另外一个图层，用tplayer，lvgl只要把背景设置成透明就可以看到下面的视频
需要手动在id.c文件里面添加nand支持，uboot和内核都要加